I have a 5 year old Whirlpool Duet electric dryer that functions in all aspects except one. It doesn't warm the air to a temperature high enough to dry clothes. What diagnostics approach do you recommend? What sequence of parts should be replaced?

Often what seems like a dryer problem is an air flow problem so try the below.

Undo the dryer from the exhaust
Run a load
If the load dries correctly then you have a vent problem.
Clean/check the vent system. Make sure the outside louvers open fully.

If you do not want lint in the house.
Take a pair of pantyhose, put one leg into the other and attach this to the dryer exhaust.
Leave enough room behind the dryer so it can blow out like a windsock.
Run a load.

Both the above will allow you to check the air flow and temp.
Also the above is NOT recommended for a gas dryer due to possible carbon monoxide problems.

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